There is the PhoneNumber type to validate phone numbers: from pydantic import BaseModel from pydantic_extra_types.phone_numbers import PhoneNumber class User(BaseModel): name: str phone_number: PhoneNumber user = User(name='John', phone_number='+447911123456') print(user.phone_number) #> tel:+44-7911-123456 I'm satisfied with it except the unwanted "tel:" prefix. I applied a trick like that: from pydantic import BaseModel from pydantic_extra_types.phone_numbers import PhoneNumber class User(BaseModel): name: str phone_number: PhoneNumber @model_validator(mode="after") def remove_prefix_from_phone(self) -> "User": if self.phone_number: self.phone_number = self.phone_number.removeprefix("tel:") return self user = User(name='John', phone_number='+447911123456') print(user.phone_number) #> +44-7911-123456 But problem is that I convert the field into str and the PhoneNumber class is not even considered as str subtype unlike EmailStr for example. Seems like it a bad move and MyPy marks it as error as well - incompatible types in assignment (meanwhile, the validation logic is fine). Maybe I could do it smarter? I couldn't think of other options but it should be done within the Pydantic model for sure, because I load data from DB in a web-service and prefix would be exist in auto-generated response. Would be glad for any piece of advice! Continue reading...
